Ordered some parts for the 446 and they showed up in the mailbox today.

The tractor hasn't been charging very well Occasionally it would charge for a few minutes but then nothing.

So being somewhat conservative in nature I decided to not go with genuine parts and ordered a 3 terminal replacement regulator/rectifier.

The original is on the left and the new one is on the right...

The original Regulator had one yellow charging wire attached to it with the second yellow wire attached to the red wire going to the battery.

I simply attached the 2 yellow wires to the terminals marked AC on the new regulator and the red wire to the terminal marked Battery. Gave it a test run tonight and it works great,, Charges at 10 amps for awhile and then starts going down until it stays steady at 2 amps on the amp meter. Sure is nice to have it working right.

Sounds like it's working properly. Those run pretty warm if they are attached to the engine tin somewhere. Heat is bad for electronics so they eventually quit working. If it worked for 20-30 yrs then it's due to be replaced.

I had the old finned box style on my Sears Tecumseh OH160, but it was fried when I got it. Switched over to the new style you just bought from a Kohler 22 motor but it was 15 amp on my 20 amp syste, got it used so it didn't last long, then I switch to one I had like your original, I just burnt it up as my sears uses a battery coil ignition and a winch mounted bucket on the front. I am looking to go for an Onan style regulator as they are at least 20 amp and may do me better. Right now I'm just charging battery off a GM alternator I have mounted on there.

I picked this one because of the 20 amp rating. I realize that in today's world a lot of marketing hype is used. Also this is mounted on a tin away from the motor that is approx 12 x 15 inches I put dielectric grease on it to help with the heat issues.